11. Hard water does not wash clothes well because: Athe salts speed up the cleaning action and hard water contains insufficient salts to do this Bthe salts react with the soap to form a grey scum instead of attaching to the dirt particles Cthe water is hard to touch and it is unpleasant for people to touch the water when washing clothes

12. The type of water that produces the greatest lather of bubbles is: Aany type of water Bhard water Csoft water

13. Soaps and detergents that can be easily broken down by bacteria in the environment to form harmless substances are termed: Abiodegradable Bnon-biodegradable Cenvironmentally unfriendly

14. The additive in many soaps and detergents that greatly harm the environment is: Aperfume Bsalts Cphosphates

15. When phosphates from cleaning products reach our waterways, they encourage the rapid growth of algae. This in turn extracts too much oxygen from the water and fish suffocate. This harmful process is: Aphosphatisation Beutrophication Chydrophilic